Brake control apparatus



July 28, 1931';

5. J. BOUGHTON BRAKE CONTROL APPARATUS Filed July 8, 1926 IN VEN TOR.

iFig; jVII'is afdiagra m ii isingshovvh fig i a fish su b means I m- :3 a c ,r r

a ,4, rnnyior ToLED onIo;

A ooRroRArion or o'mo arteknwoon'rnon r annli'rns I This invention matters improvements in brak-- mtr01 apparatus; having reference particularly" to brakes ,fpr' automotivevehiffeelt of the brakes during manual ap ,plication. a

" A110 heri Object isfthe provision' offcbnem A connections 'forthe servo-motor attached to the pedal employed for the manualapplica- 1: 1 i of h 'bmkesia d Pa ti u y 0 1 Ytion's-of this kindWhichmjay he operated in v p e t ym" he pe lpo Other ob ects, and obj (its "1 'tailsofconstructionjand economies-of manu- ;facture5,will jappear as l; proceed w th I 'des'criptionf of thoseembodiments of the ns;

. ventioll which; for the, purposes of the pres- *i entapp t en, "li'har'eyil u at d1 n: th v' 1 accompanying. jclrawings,ginivvhichf;

; 1 3 Fig e l a vie in pe1i pe t ve h i i s i ilsomewhat' 'diagramniatically a b ake contro 'mechanism embodying my invention. I

V {-,Fig: Kids a; detail,- sectional vievvfi-llus- "matin a," Valve mechanism may be. and I employed; to controhthe admiss hausti'of fluid fromfthe cyl nd eotor-as {the servO- Fig; 111

' actuating-thevalve'contr 1 Similar "reference characters or refer j 1 partsthronghoutftheiviivs; i,

ds-= r the rear the drawingsjzpull 'o ilo'rake ,actiiatorsiof' an autom0 i1 l" T11 i tratediatl0fleeing attached attheir forvvard .1 to dependingiarms 11 Whichare r gidly I i mounted upon'aroek shaiit '12;sprin"gs 13 belSflIl Which is incorporated servo-m tor m a modifiedfform of the mebhanismr 1) fieee. [semi no. [121,154.

application is removed; v there are also secured two other depending nections with the manual pull rod 16 andthe power pull rod 17 respectively. The rod 16 is-pivotedat its forward end to a short crank ISfixed to aroclrshalt 19 upon which issecured f'a lever 1 20, I the movement of which against itsmretracting spring'Ql serves to manuallyoperate the brakes. The lever 20 is preferably provided Witha'fiXed arm 22 f projecting through a slot 23 in the toe board of the automobile With a pedal pad 24 at'its T upper. endinorder to permit convenient o'pteration oi" the lever by foot pressure of the driver. p f The servo-motor may: be of any known I character the particular type of motor heing unimportant .so far as this invention; is'concerned, ,However, prefer to employ a motor operated the suction w'hich is'incluced in the manifold of an internal combustion enof power henever the car is in motion, a ncl releasing the brake's after the force of: To the shaft 12 arms 14 and 15; joined lost motion congine, as such a motorflirnishes an abundance. Q

gin any eventivhene verthe engineis'runnin'g. l II1" tl1Q (llLWl11gS I have shown a';cas 1ig2'5' ithin wh ch is located acyhnderfZG having ,17, thez latterextending through a hole 28 in the casing -is a valve chamber29inwhich is a piston 27to which is attached the pullrod i v \QQ' thecasing. Below thecylinder263'but Within located a valve mechanism comprising an v I outer valve piece 30 slidable new chamber 29 and an inner valve piece 31 slidahlev in a socket inrtheouter valve piece 30. A tube 32 p forms a fluid tight connection hetiveenthe engine'manifold above the throttle" and the :valve chamber 29, hile there is further connection 33 in the wall which separates the stops preferto make this spring means cylinder 26 and the valve chamber 29." The inner valve piece 31 hasa cut-out portion 34" p ,onits upperside, serving in certain posit i-ons i of the two valve-pieces toadmit atmospheric air'to thepassage' i Spring means e ployed to hen: the outer; valve piece 30 normally against hei 7 I the valve piece approaches its stops 36 than is required to compress it the same amount when" the valve iece 30 is near the I limit of its motion in the other direction, that is, near the stops 35. This spring means may be so des gned and proportioned as to require J a )rogressively greater amount of force for COHIPIGSSIOII to a unit amount as the valve piece 30 moves to the left, this type being the the casing.

type illustrated at 37 in the drawing.

The valve piece 30 has an operating rod 38 pivoted thereto and extending throngh an opening in the casing, this rod belng in turn pivotally connected to one arm of a bell crank lever 39 which is pivoted to a bracket 40 on v The'inner valve piece 31 has pivotally attached thereto an operating rod 41, the opposite end. of which is pivoted to an arm 12 swinging. from a bracket/13 onthe casing 25 and having-at its opposite end a pm and slot connection with the pull rod 17 The valve piece 30 has a center socket 4&1 within which the inner valve piece' 31 slides and from this socket there extend in diametrically opposite directions passages and 46 which open into longitudinal grooves 47 and 48 respectively that are arranged to register with the pipe 32 and .the passage 33 in all positions of the valve piece. r

as v

- When the bell crank 39 is operated to move the rod 38 to the left, compressing the spring 37, the. valve piece '30 is caused to travel to the left away'from the inner valve piece 31 and thu'sconnection is set up betweenthe suction pipe 32 andthe passage 33 across the groove 47, passage 45, socketM, passage46 and groove 48. Suction being thus permitted to act'in the'cylinder 26 causes the piston 27 to move to the left and'through the arm 15 and rock shaft 12m operate the brakes. However, the movement of the'pull rod 17 to theleft jcarries withit 'the'swinging arm 42, and thus the rodetl whichis attached to the inner valve piece" 31, and the motion of the latter to theleft follows the motion of the outen'valve piece 30 and closes the suction line by'breaking connection between the passages y 4-5 and .46. Hence, the degree of movement of the piston 27 is made dependent upon the degree of motion'of the rod 38. i

' In controlling the movement of the rod 38 LI preferto attach it to one arm of a bell crank lever 39, previously referred to, to the other arm of whichis, pivoted a short link-49 carry 111g a pin 50 on its upper end; The link 49 extends through a slot 51 in a yoke 52 that is 7 carried at the'lower end of a reciprocablerod 53, the yoke having a' curved surface 54 against whichthe' pin 50 bears, being held thereto by the tension of the spring 37. The axis of the rod 53 shouldintersect the axis of the rock'shaft19and may, if desired, pass through and be guided and supported thereby, as indicated'in Fig. III.

* Inthe form of the invention shownin Fig.

I,"th eupper end of the rodi53 is pivoted to one arm ofa bell crank lever 55', to the other arm of which is'pivoted a link 56 which extends through slot23 andispivotally connected to the upper end of pedal pad 24:. In this form the pedal pad itself is" connected to the lever arm 22 by a'transverse hinge, the position of which is indicated at 57 in the diagrammatic views, F-igs. V and VI.

In the modification illustrated in Fig. VII the lever 20 carries a bell crank 55 which is arranged to be swung about its pivot by a push rod 56 adapted to be operated by the drivers foot, this push rod 1 having fixed thereon a collar 58 which will engage the lever 20 after the rod '53has been moved sufficien't-ly'to fully actuate the valve piece '30. Thereafter pressure applied to the push rod will turn the rock shaft 19 and. operate the brakes'manually, assuming that no engine suction is available. j 1 .Referring now to Figs. IV, V and VI, Fig. IV shows the parts in their released p0sition. It will be noted that the'pedal pad 24 is inclined toward the horizontal considerably, making the two angles'betweenthe pad and the lever arm 22 quite unequal. Fig. V shows the parts inthe positions theyoccupy when the servo-motor valve mechanism is actuated to its fullestext'ent, while the lever 20 remains fixed; In this case the pad 24 is more nearly perpendicular to the arm 22, which is the natural position of the pad when considerable effort is to be exerted to swing I thelever 20; Fig. VI shows the parts in the positions of both manual and power application of the brakes Incarrying out this form of the inventionthe inclination of the pad 24 in the brake releasediposition is such that it is highly mprobable that a driver, even in an emergency, will unwittingly fail to use his power brakes, becauseif he pushes'hard' on the brake pedal he'is almost certain to turn theipad 24 from the position of Fig. IV to that" of Fig. VI Inifact, it would befunnatural for him to" do otherwise. If deemed desirable, the spring 37 may be made strong enoughso that it cannot be fully compressed and full power application j'obtained until there-has been more or less manual effort exerted by the swinging of the lever 20.

Thespring 37'is the only detail of the servo-motor which constitutes any part of the presentfinvention, it being understood that this spring could be locatedelsewhere in the control mechanism without affecting the operation thereof. Furthermore, any one of the; various known typesof servo-motors might be employedwithoutfaffecting the invention in this case, and; where the-words power cylinder are .employed hereinafter they are to'be construedas covering any equivalent su h, for instance, as a bellows. --I cla m asfmy inventlon'fz 1: i

71. In an automotive i vehicle, "brakes, a

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' medium for applyingthe brakes, a: level" for bringing said medium into operation, a servo- 1 motor, an operative connection between said motor and said medium, valve mechanism for controlling the saidmotor, "and means supported upon said lever embodying an element ilongitudinally movable in a line passing through the pivotal axis of said lever-for operating said valve mechanism I 1 v 2. In a control for aservo-m tor,a longi v tudinally movable link 'mounted to swing about an axis intermediateits endsfv alve operating means for said servo-motor, and a oonnection between said link and said *means" v .eflecti've during the longitudinal movement" of the link but notaflected by the swingingf movement thereofl' In testimony whereof 'Iaffix my signature.

SOLONIJQ BOUGHTON;

i570 r "55 J 

